Brown vat dye.



UNITED STATES PATENT OFFICE.

ARTHUR w'r'rnmorrnusmr MANNHEIM. AND Q'I'TO LOHSE AND AUGUST sArPEB, or LUDWIGSHAFEN-ON-THE-RHINE, GERMANY, AS$IGNOBS To BADISCHE ANILIN -& SODA FABRIK, 0F LUDWIGSHAIEN -ON-THE-BHINE, GERMANY, A CORPORATION."

- Brown var DYE;

No Drawing.

Patented Mar. 17,1914. 747,077.

To all whom it may concern:

.Be it known that we, ARTHUR Lii'r'rnma HAUS, Ph. D., Orro Lonsn, Ph. D., and AUGUST SAPPER, Ph. D., chemists, citizens of the German Empire, residing the first at Mannheim and the others at Ludwigshafenon-the-Rhine, Germany, have invented new and useful Improvements in Brown Vat Dyes, of which the following is aspecifica- 'We have discovered a new vat coloring matter which we jud e, from our investigations, to be an acri n-acridone compound derived from diphenyl, in which there, is an anthraquinone-acridone group on the one side and an anthraquinone'acridin oup on the other side of the lin ing. It probably possesses a constitution corresponding to the formula This compound can be obtained \by'condensing para amino para chlor diphenyl with one molecular proportion of "lchloranthraquinone-2-carboxylic acid and heating the product with acetic anhydrid and a little sulfuric acid whereupon rin formation takes lace, an acridone ring eing apparently ormed. This intermediate product is condensed with l-amino-anthraquinone and then heated with strong sulfuric acid, whereupon an acridin ring 1s apparently formed,

so that the desired acridin-acridone is ob-- tained. a

The aforesaid new coloring matter can also be manufactured in another way. We have found that the product obtained when following example 18 of th specification of sisti British Patent No, 2394 11 is a mixture con- 0 v principal]: tive o' the new c0 oring matter together with a d1acr1done. Upon heating the with dilute sulfuric acid containing about 60% of H,SO or treatin it in other a le manner, the carboxy ic r up be split off from the acid and the new coloring matter, that is to say, the acridin-acrldone produced mixed with the diacridonef The new acridin-acndone dyes cotton,

. from an alkaline hydrosulfite vat, producin reddish brown shades. The m xture 6 acridin-acridone and diacridone, obtainable as aforesaid, can also be employed for dye,- ing cotton from the vat and produces shades o f'brown w ich are somewhat more violet than those produced by the acridin-acridone alone i a i If desired, the mixture of 'acridin-ac i dope, and diacridone can be resolved into its. constituents by extraction with hot meta criasal, in which the acridinacridone is fairly s u we wish to be understood as claiming our new acridin-acridone either alone or in admixture *with other compounds for instance with'the aforesaid diacridonc.

Y The following examples will serve to illustrate further the nature of our invention,

which, however, is not limited to these examples. The parts are by weight.

Example 1': Heat together for about 12 hours at 140 C., while stirring, 50 parts of para-amino-para-chlor-diphenyl, 67 parts of '1-chlor-anthraquinone-2-carboxylic acid and 450 arts of dimethyl-anilin. Remove the dimet yl-anilin by means ofboiling dilute hydrochloric acid, wash the residue and extract it by means ofboiling sodium carbonate solution, then wash it with water and dry it. Then heat 80 parts of the product with 480 parts of acetic anhydrid, on the waterbath, for about 1 hour, then add ,to the yellowbrown solution 36 parts of 97% sulfuric acid and heat for 1 hour at 125 C. Filter off the product, wash'it with glacial acetic acid, and then with water, and dry it. Then boil together, for 12 hours, 30 parts of this product, 18.3- parts of l-amino-anthraquinone, 12 parts of calcined soda, 3 parts of cuprous chlorid, and 300 parts of dry mtrobenzene. When cold, filter off the precipitate, wash it with nitrobenzcne, distil ofi the 0 h lf oxyl drivaremaining nitrobenzene with steam and extract bymeans. of boiling dilute hydrochloric acid, and dry. Then heat together at, 125 (3., for about'8 hours, 30 parts of this it. The acridin-acridone thus obtained is a dark brown powder which is very diflicultly soluble in the ordinary organic solvents, the solution being red-brown.

. more soluble in meta-cresol. Its solution in concentrated sulfuric acid is olive and it dyes cotton, from a red-violet hydrosulfite vat, reddish brown shades of excellent fastness.

Example 2: Dissolve 84 parts of l-chloranthraquinone-Q-carboxylic acid and 36 parts of calcined soda in 500 parts of water. Add 36 parts of magnesium oxid and 26.4 parts of benzidin, and heat the whole, in an autoclave, while stirring, at 140 C. for 12 hours. This gives rise to a body which is regarded as dianthra'quinonyl benzidin dicarboxylic acid. Take up the mass with 4,000 parts of water, heat up, and acidify with hydrochloric acid. Filter off While hot, wash with hot water, and dry. Introduce 75' parts of this product slowly into 750 parts of 96% sulfuric acid, then raise the temperature to from 125 to 130 Cl and maintain this temperature for about 5 hours. At this stage It is somewhat a mixture, consisting principally of diacridone and acrldin-acndorie carboxyhc acld 1s obtained. To the cooled mass add 450 parts of ice and then heat for 24 hours, while stirring, at about 130. (3., whereby the carlooxyl group is split olf. Pour into 4,000 parts of hot water, filter, wash with water, and extract with dilute boiling caustic soda until the filtrate is almost colorless. Then make it .into a paste. The product consists practically of a mixture of acridin-acridoneand diacridone. It forms a red-violet vat with hydrosulfite and dyes cotton brown shades of excellent fastness.

Now what we-claim is rr The new 'dye derived from diphenyl containing an anthraquinone-acridone group on the onejside and an anthraquinone-acridin group on the other side of the diphenyl linking, which is free from salt-building groups and whichdyes cottomfrom a vat, reddish brown shades.

In testimony whereof we have hereunto set our hands, in-the presence of two subscribing witnesses.

ARTHUR LUTTRINGHAUS. OTTO LOHSE. AUGUST SAPPER.

Witnesses:

J. ALEX. 'LLoYn, JOSEPH Prm'rsn. 

